./Ultimate.py --spec ../sv-benchmarks/c/properties/no-overflow.prp --file ../sv-benchmarks/c/recursive-simple/sum_non.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 9a8b2e8d Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive-simple/sum_non.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Overflow-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 2355a4d05f76bd59f1e3cc71c2462258521b54a0 ................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(OVERFLOW) --- Real Ultimate output --- This is Ultimate 0.1.25-9a8b2e8 [2020-10-20 06:29:12,184 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-20 06:29:12,187 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-20 06:29:12,228 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-20 06:29:12,229 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-20 06:29:12,238 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-20 06:29:12,241 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-20 06:29:12,244 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-20 06:29:12,249 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-20 06:29:12,257 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-20 06:29:12,259 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-20 06:29:12,260 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-20 06:29:12,261 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-20 06:29:12,264 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-20 06:29:12,265 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-20 06:29:12,267 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-20 06:29:12,268 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-20 06:29:12,270 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-20 06:29:12,272 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-20 06:29:12,279 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-20 06:29:12,281 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-20 06:29:12,282 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-20 06:29:12,284 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-20 06:29:12,285 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-20 06:29:12,297 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-20 06:29:12,302 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-20 06:29:12,302 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-20 06:29:12,303 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-20 06:29:12,304 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-20 06:29:12,305 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-20 06:29:12,307 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-20 06:29:12,308 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-20 06:29:12,311 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-20 06:29:12,312 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-20 06:29:12,314 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-20 06:29:12,315 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-20 06:29:12,316 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-20 06:29:12,316 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-20 06:29:12,317 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-20 06:29:12,318 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-20 06:29:12,318 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-20 06:29:12,321 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Overflow-32bit-Automizer_Default.epf [2020-10-20 06:29:12,357 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-20 06:29:12,357 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-20 06:29:12,359 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-20 06:29:12,360 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-20 06:29:12,360 INFO L138 SettingsManager]: * Use SBE=true [2020-10-20 06:29:12,360 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-20 06:29:12,361 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-20 06:29:12,361 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-10-20 06:29:12,361 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-20 06:29:12,361 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-20 06:29:12,363 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-20 06:29:12,363 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-20 06:29:12,363 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-20 06:29:12,364 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-20 06:29:12,364 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2020-10-20 06:29:12,364 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-20 06:29:12,365 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-20 06:29:12,365 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-20 06:29:12,365 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-20 06:29:12,365 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-20 06:29:12,366 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-20 06:29:12,366 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-20 06:29:12,366 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-20 06:29:12,366 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-20 06:29:12,367 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-20 06:29:12,367 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-20 06:29:12,367 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-20 06:29:12,367 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-20 06:29:12,368 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-20 06:29:12,368 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-20 06:29:12,368 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-20 06:29:12,368 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2355a4d05f76bd59f1e3cc71c2462258521b54a0 [2020-10-20 06:29:12,587 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-20 06:29:12,607 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-20 06:29:12,614 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-20 06:29:12,615 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-20 06:29:12,616 INFO L275 PluginConnector]: CDTParser initialized [2020-10-20 06:29:12,617 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/sum_non.c [2020-10-20 06:29:12,693 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5db1b9fab/f52800ecbc634748bc2c714681321320/FLAGc92e01b8c [2020-10-20 06:29:13,179 INFO L306 CDTParser]: Found 1 translation units. [2020-10-20 06:29:13,180 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/sum_non.c [2020-10-20 06:29:13,186 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5db1b9fab/f52800ecbc634748bc2c714681321320/FLAGc92e01b8c [2020-10-20 06:29:13,557 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5db1b9fab/f52800ecbc634748bc2c714681321320 [2020-10-20 06:29:13,561 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-20 06:29:13,568 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-20 06:29:13,569 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-20 06:29:13,569 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-20 06:29:13,573 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-20 06:29:13,574 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 06:29:13" (1/1) ... [2020-10-20 06:29:13,578 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2eb3106e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:29:13, skipping insertion in model container [2020-10-20 06:29:13,578 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 06:29:13" (1/1) ... [2020-10-20 06:29:13,586 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-20 06:29:13,605 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-20 06:29:13,854 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 06:29:13,867 INFO L203 MainTranslator]: Completed pre-run [2020-10-20 06:29:13,884 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 06:29:13,901 INFO L208 MainTranslator]: Completed translation [2020-10-20 06:29:13,901 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:29:13 WrapperNode [2020-10-20 06:29:13,901 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-20 06:29:13,902 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-20 06:29:13,902 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-20 06:29:13,903 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-20 06:29:13,911 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:29:13" (1/1) ... [2020-10-20 06:29:13,917 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:29:13" (1/1) ... [2020-10-20 06:29:13,937 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-20 06:29:13,937 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-20 06:29:13,937 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-20 06:29:13,938 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-20 06:29:13,948 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:29:13" (1/1) ... [2020-10-20 06:29:13,948 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:29:13" (1/1) ... [2020-10-20 06:29:13,949 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:29:13" (1/1) ... [2020-10-20 06:29:13,949 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:29:13" (1/1) ... [2020-10-20 06:29:13,958 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:29:13" (1/1) ... [2020-10-20 06:29:13,960 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:29:13" (1/1) ... [2020-10-20 06:29:13,961 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:29:13" (1/1) ... [2020-10-20 06:29:13,963 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-20 06:29:13,963 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-20 06:29:13,964 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-20 06:29:13,964 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-20 06:29:13,965 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:29:13" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-20 06:29:14,023 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-20 06:29:14,023 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-20 06:29:14,024 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-10-20 06:29:14,024 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-10-20 06:29:14,024 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-20 06:29:14,024 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-20 06:29:14,250 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-20 06:29:14,251 INFO L298 CfgBuilder]: Removed 6 assume(true) statements. [2020-10-20 06:29:14,252 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 06:29:14 BoogieIcfgContainer [2020-10-20 06:29:14,253 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-20 06:29:14,254 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-20 06:29:14,254 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-20 06:29:14,257 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-20 06:29:14,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.10 06:29:13" (1/3) ... [2020-10-20 06:29:14,258 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7cd4fb4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 06:29:14, skipping insertion in model container [2020-10-20 06:29:14,259 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:29:13" (2/3) ... [2020-10-20 06:29:14,259 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7cd4fb4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 06:29:14, skipping insertion in model container [2020-10-20 06:29:14,259 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 06:29:14" (3/3) ... [2020-10-20 06:29:14,261 INFO L111 eAbstractionObserver]: Analyzing ICFG sum_non.c [2020-10-20 06:29:14,273 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-20 06:29:14,280 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 8 error locations. [2020-10-20 06:29:14,295 INFO L253 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2020-10-20 06:29:14,356 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-20 06:29:14,358 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-20 06:29:14,358 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-20 06:29:14,358 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-20 06:29:14,359 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-20 06:29:14,359 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-20 06:29:14,359 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-20 06:29:14,360 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-20 06:29:14,383 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2020-10-20 06:29:14,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-10-20 06:29:14,400 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 06:29:14,401 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-10-20 06:29:14,401 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr5ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2020-10-20 06:29:14,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:29:14,411 INFO L82 PathProgramCache]: Analyzing trace with hash 890593104, now seen corresponding path program 1 times [2020-10-20 06:29:14,423 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:29:14,437 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1272061224] [2020-10-20 06:29:14,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:29:14,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:29:14,637 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:29:14,637 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1272061224] [2020-10-20 06:29:14,638 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-20 06:29:14,639 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-20 06:29:14,640 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957298728] [2020-10-20 06:29:14,645 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-20 06:29:14,645 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 06:29:14,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-20 06:29:14,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-20 06:29:14,662 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 6 states. [2020-10-20 06:29:14,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 06:29:14,877 INFO L93 Difference]: Finished difference Result 57 states and 60 transitions. [2020-10-20 06:29:14,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-20 06:29:14,879 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2020-10-20 06:29:14,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 06:29:14,891 INFO L225 Difference]: With dead ends: 57 [2020-10-20 06:29:14,891 INFO L226 Difference]: Without dead ends: 47 [2020-10-20 06:29:14,894 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-10-20 06:29:14,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-10-20 06:29:14,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 38. [2020-10-20 06:29:14,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-10-20 06:29:14,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 45 transitions. [2020-10-20 06:29:14,945 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 45 transitions. Word has length 6 [2020-10-20 06:29:14,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 06:29:14,946 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 45 transitions. [2020-10-20 06:29:14,946 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-20 06:29:14,946 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 45 transitions. [2020-10-20 06:29:14,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-10-20 06:29:14,947 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 06:29:14,947 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-10-20 06:29:14,948 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-20 06:29:14,948 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr5ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2020-10-20 06:29:14,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:29:14,949 INFO L82 PathProgramCache]: Analyzing trace with hash 890593264, now seen corresponding path program 1 times [2020-10-20 06:29:14,949 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:29:14,950 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [573535623] [2020-10-20 06:29:14,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:29:14,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:29:15,025 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:29:15,026 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [573535623] [2020-10-20 06:29:15,026 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-20 06:29:15,027 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-20 06:29:15,027 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862218068] [2020-10-20 06:29:15,029 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-20 06:29:15,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 06:29:15,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-20 06:29:15,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-20 06:29:15,031 INFO L87 Difference]: Start difference. First operand 38 states and 45 transitions. Second operand 5 states. [2020-10-20 06:29:15,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 06:29:15,101 INFO L93 Difference]: Finished difference Result 38 states and 45 transitions. [2020-10-20 06:29:15,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-20 06:29:15,102 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 6 [2020-10-20 06:29:15,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 06:29:15,103 INFO L225 Difference]: With dead ends: 38 [2020-10-20 06:29:15,104 INFO L226 Difference]: Without dead ends: 37 [2020-10-20 06:29:15,105 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-10-20 06:29:15,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-10-20 06:29:15,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-10-20 06:29:15,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-10-20 06:29:15,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2020-10-20 06:29:15,115 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 6 [2020-10-20 06:29:15,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 06:29:15,115 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2020-10-20 06:29:15,115 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-20 06:29:15,116 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2020-10-20 06:29:15,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-10-20 06:29:15,116 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 06:29:15,117 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:29:15,117 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-20 06:29:15,117 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, sumErr5ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2020-10-20 06:29:15,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:29:15,118 INFO L82 PathProgramCache]: Analyzing trace with hash 1838582506, now seen corresponding path program 1 times [2020-10-20 06:29:15,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:29:15,119 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679357859] [2020-10-20 06:29:15,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:29:15,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:29:15,142 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:29:15,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:29:15,161 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:29:15,185 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:29:15,186 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-20 06:29:15,186 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-20 06:29:15,218 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.10 06:29:15 BoogieIcfgContainer [2020-10-20 06:29:15,219 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-20 06:29:15,219 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-20 06:29:15,219 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-20 06:29:15,232 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-20 06:29:15,233 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 06:29:14" (3/4) ... [2020-10-20 06:29:15,235 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-10-20 06:29:15,282 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2020-10-20 06:29:15,282 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-20 06:29:15,285 INFO L168 Benchmark]: Toolchain (without parser) took 1722.10 ms. Allocated memory was 38.8 MB in the beginning and 46.7 MB in the end (delta: 7.9 MB). Free memory was 15.4 MB in the beginning and 27.9 MB in the end (delta: -12.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 14.3 GB. [2020-10-20 06:29:15,286 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 30.4 MB. Free memory was 16.1 MB in the beginning and 16.1 MB in the end (delta: 27.3 kB). Peak memory consumption was 27.3 kB. Max. memory is 14.3 GB. [2020-10-20 06:29:15,287 INFO L168 Benchmark]: CACSL2BoogieTranslator took 332.72 ms. Allocated memory was 38.8 MB in the beginning and 39.3 MB in the end (delta: 524.3 kB). Free memory was 14.5 MB in the beginning and 13.9 MB in the end (delta: 608.1 kB). Peak memory consumption was 7.8 MB. Max. memory is 14.3 GB. [2020-10-20 06:29:15,288 INFO L168 Benchmark]: Boogie Procedure Inliner took 34.68 ms. Allocated memory is still 39.3 MB. Free memory was 13.9 MB in the beginning and 12.3 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 14.3 GB. [2020-10-20 06:29:15,289 INFO L168 Benchmark]: Boogie Preprocessor took 25.86 ms. Allocated memory is still 39.3 MB. Free memory was 12.2 MB in the beginning and 11.1 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 14.3 GB. [2020-10-20 06:29:15,289 INFO L168 Benchmark]: RCFGBuilder took 289.37 ms. Allocated memory was 39.3 MB in the beginning and 41.9 MB in the end (delta: 2.6 MB). Free memory was 11.0 MB in the beginning and 13.8 MB in the end (delta: -2.9 MB). Peak memory consumption was 3.8 MB. Max. memory is 14.3 GB. [2020-10-20 06:29:15,290 INFO L168 Benchmark]: TraceAbstraction took 964.89 ms. Allocated memory was 41.9 MB in the beginning and 44.6 MB in the end (delta: 2.6 MB). Free memory was 13.4 MB in the beginning and 10.8 MB in the end (delta: 2.6 MB). Peak memory consumption was 5.2 MB. Max. memory is 14.3 GB. [2020-10-20 06:29:15,291 INFO L168 Benchmark]: Witness Printer took 63.33 ms. Allocated memory was 44.6 MB in the beginning and 46.7 MB in the end (delta: 2.1 MB). Free memory was 10.7 MB in the beginning and 27.9 MB in the end (delta: -17.2 MB). Peak memory consumption was 8.2 kB. Max. memory is 14.3 GB. [2020-10-20 06:29:15,297 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 30.4 MB. Free memory was 16.1 MB in the beginning and 16.1 MB in the end (delta: 27.3 kB). Peak memory consumption was 27.3 kB. Max. memory is 14.3 GB. * CACSL2BoogieTranslator took 332.72 ms. Allocated memory was 38.8 MB in the beginning and 39.3 MB in the end (delta: 524.3 kB). Free memory was 14.5 MB in the beginning and 13.9 MB in the end (delta: 608.1 kB). Peak memory consumption was 7.8 MB. Max. memory is 14.3 GB. * Boogie Procedure Inliner took 34.68 ms. Allocated memory is still 39.3 MB. Free memory was 13.9 MB in the beginning and 12.3 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 14.3 GB. * Boogie Preprocessor took 25.86 ms. Allocated memory is still 39.3 MB. Free memory was 12.2 MB in the beginning and 11.1 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 14.3 GB. * RCFGBuilder took 289.37 ms. Allocated memory was 39.3 MB in the beginning and 41.9 MB in the end (delta: 2.6 MB). Free memory was 11.0 MB in the beginning and 13.8 MB in the end (delta: -2.9 MB). Peak memory consumption was 3.8 MB. Max. memory is 14.3 GB. * TraceAbstraction took 964.89 ms. Allocated memory was 41.9 MB in the beginning and 44.6 MB in the end (delta: 2.6 MB). Free memory was 13.4 MB in the beginning and 10.8 MB in the end (delta: 2.6 MB). Peak memory consumption was 5.2 MB. Max. memory is 14.3 GB. * Witness Printer took 63.33 ms. Allocated memory was 44.6 MB in the beginning and 46.7 MB in the end (delta: 2.1 MB). Free memory was 10.7 MB in the beginning and 27.9 MB in the end (delta: -17.2 MB). Peak memory consumption was 8.2 kB. Max. memory is 14.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 8]: integer overflow possible integer overflow possible We found a FailurePath: [L15] int a = __VERIFIER_nondet_int(); [L16] int b = __VERIFIER_nondet_int(); [L17] CALL sum(a, b) VAL [\old(m)=-2147483648, \old(n)=-1] [L7] COND TRUE n <= 0 VAL [\old(m)=-2147483648, \old(n)=-1, m=-2147483648, n=-1] [L8] m + n VAL [\old(m)=-2147483648, \old(n)=-1, m=-2147483648, n=-1] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 32 locations, 8 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.8s, OverallIterations: 3, TraceHistogramMax: 1, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 31 SDtfs, 87 SDslu, 71 SDs, 0 SdLazy, 111 SolverSat, 10 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=38occurred in iteration=1, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 2 MinimizatonAttempts, 9 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.1s InterpolantComputationTime, 19 NumberOfCodeBlocks, 19 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 10 ConstructedInterpolants, 0 QuantifiedInterpolants, 140 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...